[ltt-dev] UST communication library

[David Goulet]

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On 11-06-15 11:06 AM, Yannick Brosseau wrote:
> On 2011-06-14 17:26, David Goulet wrote:
>> Hi everyone,
>>
>> We are in the process of moving out the UST control library out to lttng-tools
>> (thus soon deprecating ustctl and usttrace from the UST git tree). However,
>> there is a common part which is the communication library (libustcomm) where
>> every command to the tracer and responses are done through a Unix socket using
>> that specific libs (that contains key functions to pack/unpack data).
>>
>> So the problem is where this lib should go? Here are the possibilities I've
>> discussed with Mathieu:
>>
> 
> 7) Define a communication protocol and implement it on both side. That
> way, you have to library to depends on.
> 

This is a re-write of the actual code (will be the third time), code duplication
across two git tree and handling data function will be the same both sides since
it's a bidirectional communication. I really think it's not the best way to do
this.

For this use case where two program needs to communicate together, we need a
third part communication library. So single point of failure, single point to
maintain and no dependency between packages, only the lib, it's a trade off.

Thanks
David

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